Unless you fly a lot on company dime or live in a city with not a lot of alternatives, everyone really should be free agent. The low tier status on legacies aren't worth much of anything. Unless AA at NYC, because you can still get a bunch of free upgrades. Nowadays, JetBlue simply doesn't work for my travel pattern at all. Although, that might change once they start flying to Europe. We will see. This has allowed me to always book the cheapest reasonable J or F seating. Which means no Delta flying ever, since their pricing is outrageous out of NYC. UA always seem to offer the most reasonable F pricing domestically for me. AA always seem to have the cheapest J fares on JFK-LAX/SFO.